Improvement in hot-air grates



PATENTBD DBG. 22, 186s, T. P. RANDOLPH.

HOT AIR GRATE.

UNiTnD STATES PATENT OFFICE.

THEODORE F; RANDOLPH, OF 4(3INC'INNA'II,YOHIO.

IMPROVEMENT IN HOT-AIR GRATES.

SpecificationA forming part of Letters Patent No. 41,01 9, dated December 22, 1R63.

To aZZ whom z' may concern.-

Beit known that I, T. F. RANDOLPH, of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and .useful lmprovement in HotAir Grates; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and letters of reference marked thereon, forming part of this specification.

My invention relates to an improvement on the hotair grates in vented by John McMurtry,

'patented January 22, 1861; and it consists in making the hot-air chamber, or all the sides thereof, inaddition to the corrugated tire'- .sheet er cast-meta-heither-rivetedorotherwise appropriately secured to the corrugated tire-back, forming therewith a tight chamber more secure from smoke and more conveniently arranged in the tire-place than when the chamber` is formed by the bricks in connection with th`e corrugated back.

ln the accompanyii'ig drawings, Figure lis a sectionalperspective of the grate, fire-back, and hot-air chamber. Fig. 2 is a horizontal section of chamber, showing a mode of unit- -ing the sheet or cast metal part of the chamber to the castmetai lire-back. l

Like letters ot' reference indicate corresponding parts in the different figures.

' A is the grate. B is the corrugated tireback. C is the hot-air chamber, and D is the metallic case united tothe tire-back and forming therewith the hot-air chamber G. E is a cold-air duct, and F a hot-air duct. The air is taken from without, or from near the floor of the apartment in which the grate is situated, and is conducted through the passage or duct E inte the hot-air chamberO, through which it ascends and becomes heated, and is thence conveyed away by the duct F, either to another apartmentv or into the room in which the grate is placed, through register G.

The operation of' this apparatus will be perfectly understood without further explanation. It has been customary to form the chamber C in the rear of the ire back by setting the bricks inward a suitable distance from the rear face of the metal back,1eavirg a chamber between. In this plan of construction the joints made by the bricks and mortar with the metal are very insecure, and the contraction and expansion caused by the fire in the grate causes them to part and allows smoke from the grate to be admit-ted to the hot-air chamber, which is of course immediately conducted with the hotair through the duct F into the room.

A YVBy waiting the chamber closeiy'with the fire-back-in fact, making the back and cham ber complete in one part-the apparatus can be fitted up in the workshop and made entirely secure; and when required to be set in a hre-place the work can be more rapidly and conveniently done, and without any risk of making imperfect joints, which would require metal, securely joined to the re-back and. forming therewith a tight chamber, secure from smoke, as herein specified.

THEODORE F. RANDOLPH.

Witnesses:

WM. CLOUGH, D. S. REID. 

